CAUTION:
To
reduce
the
risk
of
electric
shock
or
energy
hazards:
v
This
equipment
must
be
installed
by
trained
service
personnel
in
a
restricted-access
location,
as
defined
by
the
NEC
and
IEC
60950-1,
First
Edition,
The
Standard
for
Safety
of
Information
Technology
Equipment.
v
Connect
the
equipment
to
a
reliably
grounded
safety
extra
low
voltage
(SELV)
source.
An
SELV
source
is
a
secondary
circuit
that
is
designed
so
that
normal
and
single
fault
conditions
do
not
cause
the
voltages
to
exceed
a
safe
level
(60
V
direct
current).
v
The
branch
circuit
overcurrent
protection
must
be
rated
20
A.
v
Use
12
American
Wire
Gauge
(AWG)
or
2.5
mm2
copper
conductor
only,
not
exceeding
4.5
meters
in
length.
v
Incorporate
a
readily
available
approved
and
rated
disconnect
device
in
the
field
wiring.
CAUTION:
This
unit
has
more
than
one
power
source.
To
remove
all
power
from
the
unit,
all
dc
MAINS
must
be
disconnected.
CAUTION:
There
is
current
to
the
power
supply
and
fan
units
even
though
the
power
supply
switch
is
in
the
OFF
position.
Use
a
disconnect
device
to
shut
power
off
before
unplugging
the
dc
power
jumper
cable
from
the
dc
power
supply
connectors.
There are two ways to cable the dc power supply and fan units:
v
Single-level redundant dc cabling
v
Dual-level redundant dc cabling
Single-level
redundant
dc
cabling
In a single-level redundant dc cabling scheme, the EXP810 NEBS models are
connected to the dc power source using the two dc power cords that are shipped.
Only one dc power connector in each of the dc power supply and fan units is
connected to a dc power source. The other dc power connector in each dc power
supply and fan unit is left open. The dc power connectors A1 (
�5�
) are connected to
the left dc power source (
�1�
) while dc power connectors B1 (
�6�
) are connected to
the right dc power source (
�2�
). This cabling scheme protects against any single
failure such as failed dc source, dc power supply, or dc cable. Figure 39 on page 64
illustrates single-level redundant cabling.
Chapter 3. Cabling the EXP810
63
Summary of Contents for DS4000 EXP810
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